Fastener



FIG. 1 is a front elevational view of the fastener;

FIG. 2 is a left-side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front, right-side, top perspective view thereof;

FIG. 8 is a rear, left-side, bottom perspective view thereof; and,

FIG. 9 is a reference view showing the fastener in use.

The broken lines in FIG. 9 depict environmental subject matter that form no part of the claimed design. 

CLAIM The ornamental design for a fastener, as shown and described. 